More people die from gun deaths than from car accidents every year in the United States. However, while research-based policies have reduced motor vehicle deaths, federal research on firearm deaths is nearly non-existent. That’s due to the Dickey Amendment, which says Centers for Disease Control funding cannot be used to promote gun control. Soledad O’Brien sits down with Dr. Mark Rosenberg, who formerly oversaw gun violence research at the CDC, who says you can do the science without getting rid of weapons.